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SrTi0.5Mn0.5O3 (STMO) is a chemically disordered perovskite having randomdistribution of Ti and Mn over 1b site. Striking discrepancies about thestructural and magnetic properties of STMO demands detailed analysis which isaddressed. To explore the magnetic ground state of STMO, static and dynamicmagnetic properties were studied over a broad temperature range (2-300 K). Thedc, ac magnetization show a cusp like peak at Tf ~ 14 K, which exhibits fieldand frequency dependence. The thermoremanent magnetization is characterized byusing stretched exponential function and characteristic time suggests theexistence of spin clusters. Also the other features observed in magnetic memoryeffect, muon spin resonance/rotation and neutron powder diffraction confirm theexistence of cluster spin glass state in STMO, rather than the long rangeordered ground state. Intriguingly, the observed spin relaxation can beattributed to the dilute magnetism due to non-magnetic doping at Mn-site andcompeting antiferromagnetic and ferromagnetic interactions resulting from thesite disorder.

Evidence of a cluster spin-glass state in the B-site disordered perovskite SrTi0.5Mn0.5O3